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Classifications

H—ELECTRICITY

H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF

H02M3/00—Conversion of dc power input into dc power output

H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac

H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters

H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal

H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators

H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

In einer Ausführungsform ist dieser Betriebsmodus dadurch gekennzeichnet, dass die Batteriespannung geringer als ein erster vorbestimmter Wert ist und dass gleichzeitig die am Ausgang des Hochsetzstellers anliegende Last eine Minimallast überschreitet. In one embodiment of this mode of operation is characterized in that the battery voltage is less than a first predetermined value and that at the same time present at the output of the boost converter load exceeds a minimum load.

In den Betriebsmodi, in denen die Batteriespannung größer als der erste vorbestimmte Wert ist oder die Last die Minimallast unterschreitet, kann in Ausführungsformen die Zwischenspannung anders bereit gestellt werden, wodurch das Dimensionieren der rückführungslosen Steuerung leichter wird. In the operating modes in which the battery voltage is greater than the first predetermined value or the load falls below the minimum load, in embodiments, the intermediate voltage may be otherwise provided, whereby the dimensioning of the open loop control is easier.

Die Erfindung betrifft auch ein Verfahren zum Betrieb eines erfindungsgemäßen Gleichspannungswandlers. The invention also relates to a method of operating a DC-DC converter according to the invention.Bei diesem Verfahren wird der Hochsetzsteller rückführungslos so angesteuert, dass er die Zwischenspannung in Abhängigkeit der Batteriespannung bereitstellt. In this method, the boost converter is open loop controlled such that it provides the intermediate voltage depending on the battery voltage.Die Ausgangsspannung wird mittels einer Spannungsregelung durch den Tiefsetzsteller geregelt wird. The output voltage is regulated by a voltage control by the step-down converter.

Wie gezeigt, wird der Hochsetzsteller As shown, the boost converter is4 4nicht mit Hilfe einer Regelung, sondern mit Hilfe einer Steuerung angesteuert. not driven by means of a regulation, but with the aid of a controller.Dies gilt zumindest für den Bereich, in dem die Batteriespannung einen vorbestimmten Wert von 8 V unterschreitet und ein Minimalstrom am Ausgang O des Hochsetzstellers This is true at least for the range in which the battery voltage falls below a predetermined value of 8 V and a minimum current at the output O of the boost converter4 4fließt. flows.Es reicht hier aus, den Hochsetzsteller It is sufficient here, the boost converter4 4allein in Abhängigkeit von der Batteriespannung, ohne Rückführung der Ausgangsspannung U Z in einem Regelkreis, zu steuern. to control only a function of the battery voltage, without feedback of the output voltage U Z in a control loop.Ohne die Rückführung bzw. die Regelung kann der Hochsetzsteller Without the return or the regulation of the boost converter can4 4nicht destabilisieren. do not destabilize.Der Wert der Zwischenspannung ist bei dieser Steuerung in den überwiegenden Fällen ungleich der Batteriespannung. The value of the intermediate voltage is in this control in the majority of cases other than the battery voltage.

Switch for controlling LED, has switching devices providing currents for diode arrangements, and logic device controlling devices such that current for corresponding arrangement is not provided at same time

Partial electrical system for use in electrical system of modern motor vehicle, has switching devices controllable by controller in such way that switching position of capacitors is mutually exchangeable

Voltage supply device for use in mobile communication device, has switch regulator with input coupled with voltage input, and voltage regulator coupled with output of switch regulator, where voltage regulator is coupled with voltage output